patch 8.2.5072: using uninitialized value and freed memory in spell command

Problem:    Using uninitialized value and freed memory in spell command.
Solution:   Initialize "attr".  Check for empty line early.
diff --git a/src/version.c b/src/version.c
index ebfd0d4..8f5a4ff 100644
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5072,
+/**/
     5071,
 /**/
     5070,